VOLVO
CEM-B1D1311 - Interior Lights Circuit "A". General Electrical Failures. Circuit short to ground
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
The central electronic module (CEM) supplies the interior lighting in the passenger compartment through circuit A. The code is set when the signal from the output is too low, which can be caused by the supply wire being shorted to ground or having an open circuit.
Possible causes
- The supply wire to the interior lighting is shorted to ground
- Open circuit in the supply wire to the interior lighting
What you can do
- 1Read and clear the code, then switch on the interior lighting and see whether it works
- 2Check that the fuses for the interior lighting are intact
- 3Look for breaks and chafing on the supply wire, especially where the wiring harness is fixed
- 4Use a multimeter to check that the supply wire has no contact with ground (the bodywork) and is intact
- 5If the wire is intact, have a workshop with diagnostic equipment check the module output
Symptoms you may notice1
- The passenger compartment lighting does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.